Sixteen-year-old Ali Breaux called big sister Mayci "her rock" in an emotional interview Friday following Mayci's death in a shooting at a movie theater in Lafayette, Louisiana, Thursday night.

"She taught me how to be the strong person that I am today," Ali said tearfully. "She taught me not to care what other people think. She taught me how to be a good person."

"Mayci was one of a kind. She cared so much about our family," Ali told MSNBC's Thomas Roberts by phone Friday afternoon.

Listen and see how Roberts insists and digs deeper and deeper on the air,